1. Department of Pain Medicine, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
2. Department of Pain Control Research, The Jikei University School of Medicine, Tokyo 105-8461, Japan
3. Medical Affairs, Viatris Pharmaceuticals Japan Inc., Tokyo 105-0001, Japan
4. Division of Cancer Pathophysiology, National Cancer Center Research Institute, Tokyo 104-0045, Japan
5. Medical Affairs, Pfizer Japan Inc., Tokyo 151-8589, Japan
6. Department of Anesthesiology and Pain Medicine, Faculty of Medicine, Juntendo University, Tokyo 113-8421, Japan
7. Supportive and Palliative Care Research Support Office, National Cancer Center Hospital East, Chiba 277-8577, Japan